I am trying to write a custom parser in Python to read the following text file.
mapping.txt
MAX_FREQ_GHZ: 1234
VRM: OPEN
RefDes: U8
.port 56
domain_spec: AVDD2_LP4_EMI_SOC 0.009
pwr_pins: U17 U19 V20 V18
gnd_pins: V19 U18 U20 W16 W18 W19 V15 V21 Y18 Y20 U22 Y22 V17
.endport
RefDes: U10
.port 123
domain_spec: AVDD2_LP4_EMI_DRAM 0.008
pwr_pins: D1 B3 B5 D5 F3 H1 K1 G2 K3 A4 F5 H5
gnd_pins: C1 E1 D2 A3 G3 D4 C5 E5 G1 K2 J3 K4 G5 J1
.endport
RefDes: U10
.port 56
domain_spec: AVDD2_LP4_EMI_DRAM 0.008
pwr_pins: B10 F10 D12 B8 D8 F8 H8 A9 K10 H12 K12
gnd_pins: C12 C8 E8 D9 A10 G10 D11 E12 J12 G8 J10 K11 G12 K9
.endport
RefDes: U4 ARM
.port 344
pwr_pins: 6
gnd_pins: 3 5
.endport
RefDes: U4 ARM
.port 344
pwr_pins: 6
gnd_pins: 3 5
.endport
RefDes: U4 ARM
.port 344
pwr_pins: 6
gnd_pins: 3 5
.endport
Below is my code:
class PortMapping:
def setFrequency(self, frequence):
self.__frequency = frequence
def getFrequency(self):
return self.__frequency
def setVRMType(self, vrmType):
self.__vrmType = vrmType
def getVRMType(self):
return self.__vrmType
def setSourceDevice(self, sourceDevice):
self.__sourceDevice = sourceDevice
def getSourceDevice(self):
return self.__sourceDevice
def setSinkDevice(self, sinkDevice):
self.__sinkDevice = sinkDevice
def getSinkDevice(self):
return self.__sinkDevice
class SinkDevice:
def setReferenceDesignator(self, refDes):
self.__refDes = refDes
def getReferenceDesignator(self):
return self.__refDes
def setPort(self, port):
self.__port = port
def getPort(self):
return self.__port
def setDomainSpecification(self, domainSpec):
self.__domainSpec = domainSpec
def getDomainSpecification(self):
return self.__domainSpec
def setPowerPins(self, powerPins):
self.__powerPins = powerPins
def getPowerPins(self):
return self.__powerPins
def setGroundPins(self, groundPins):
self.__groundPins = groundPins
def getGroundPins(self):
return self.__groundPins
class SourceDevice:
def setReferenceDesignator(self, refDes):
self.__refDes = refDes
def getReferenceDesignator(self):
return self.__refDes
def setPort(self, port):
self.__port = port
def getPort(self):
return self.__port
def setPowerPins(self, powerPins):
self.__powerPins = powerPins
def getPowerPins(self):
return self.__powerPins
def setGroundPins(self, groundPins):
self.__groundPins = groundPins
def getGroundPins(self):
return self.__groundPins
def main():
with open("PinGroup_Map.TXT") as file:
portMapping = PortMapping()
sinkDevices = list()
for i, line in enumerate(file):
if line.startswith("MAX_FREQ_GHZ"):
portMapping.setFrequency(line.split(":")[1].strip())
if line.startswith("VRM"):
portMapping.setVRMType(line.split(":")[1].strip())
if line.startswith("RefDes"):
sd = buildSinkDevices(i)
sinkDevices.append(sd)
print(sinkDevices)
print(portMapping.getFrequency())
print(portMapping.getVRMType())
def buildSinkDevices(i):
with open("PinGroup_Map.TXT") as f:
sinkDevice = []
for j in range(i - 1):
next(f)
for line in f:
while line.startswith(".endport"):
sinkDevice.append(line)
return sinkDevice
if __name__=="__main__":
main()
I am reading the mapping file and creating an object of PortMapping class first. After that my text file has a set of blocks (which are Devices objects). I am currently adding them to a list but will build objects later on.
the buildSinkDevices() builds the objects (currently adding them to list). What I am trying to do is sending the current counter to the buildSinkDevices() method and then opening the file from that counter and adding the lines to the list until it reaches .endport'. This defines one device block. The buildSinkDevices()` is not adding any line to the list. Appreciate any help?
I need to also create a collection of say Device A and Device B devices. The first three blocks in the mapping file are Device A and the last three blocks in the mapping file are Device B. I am checking in my code that if line starts with RefDes. The next six lines are basically one device. How do I create that objects?
CodePudding user response：
I think it would help if you separate reading data from the file from assigning the data. Here is some example code that will extract each dataset and turn it into its own nested list:
lines = []
with open("PinGroup_Map.TXT") as file:
for line in file:
line = line.strip()
if line:
lines.append(line)
subsets = [[]]
idx = 0
while idx < len(lines):
if 'RefDes' in lines[idx]:
subsets.append([lines[idx].split(':')])
else:
subsets[-1].append(lines[idx].split(':'))
idx = 1
for s in subsets:
print(s)
Output:
[['MAX_FREQ_GHZ', ' 1234'], ['VRM', ' OPEN'], ['']]
[['RefDes', ' U8'], ['.port 56'], ['domain_spec', ' AVDD2_LP4_EMI_SOC 0.009'], ['pwr_pins', ' U17 U19 V20 V18'], ['gnd_pins', ' V19 U18 U20 W16 W18 W19 V15 V21 Y18 Y20 U22 Y22 V17'], ['.endport'], ['']]
[['RefDes', ' U10'], ['.port 123'], ['domain_spec', ' AVDD2_LP4_EMI_DRAM 0.008'], ['pwr_pins', ' D1 B3 B5 D5 F3 H1 K1 G2 K3 A4 F5 H5'], ['gnd_pins', ' C1 E1 D2 A3 G3 D4 C5 E5 G1 K2 J3 K4 G5 J1'], ['.endport'], ['']]
[['RefDes', ' U10'], ['.port 56'], ['domain_spec', ' AVDD2_LP4_EMI_DRAM 0.008'], ['pwr_pins', ' B10 F10 D12 B8 D8 F8 H8 A9 K10 H12 K12'], ['gnd_pins', ' C12 C8 E8 D9 A10 G10 D11 E12 J12 G8 J10 K11 G12 K9'], ['.endport'], [''], ['']]
[['RefDes', ' U4 ARM'], ['.port 344'], ['pwr_pins', ' 6'], ['gnd_pins', ' 3 5'], ['.endport'], ['']]
[['RefDes', ' U4 ARM'], ['.port 344'], ['pwr_pins', ' 6'], ['gnd_pins', ' 3 5'], ['.endport'], ['']]
[['RefDes', ' U4 ARM'], ['.port 344'], ['pwr_pins', ' 6'], ['gnd_pins', ' 3 5'], ['.endport']]
You only have to run this once per file, then you can collect your data from the subsets to make your objects.